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CLI apps with Typer - Python type annotations a...

Avatar for Sebastián Ramírez Sebastián Ramírez
October 10, 2022
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CLI apps with Typer - Python type annotations and shell completion

Avatar for Sebastián Ramírez

Sebastián Ramírez

October 10, 2022
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Transcript

  1. CLI apps with type annotations and shell completion

  2. Who am I? Sebastián Ramírez github.com/tiangolo linkedin.com/in/tiangolo twitter.com/tiangolo tiangolo.com Berlin,

    Germany Senior Staff Software Engineer at I created: ➕ External Consultant for other teams

  3. About Typer • 8K+ GitHub stars • FastAPI's little sibling

    • Powered by Click @tiangolo

  4. Command Line Interfaces (CLI) or Terminals @tiangolo • Text based

    • You send program and parameters • Computer goes beep boop • Maybe output • Examples of CLI apps: git, ssh, pip

  5. Simple function with type annotations @tiangolo

  6. Simple function with type annotations @tiangolo

  7. Why type annotations - error checks @tiangolo

  8. Why type annotations - completion @tiangolo

  9. Simple function with type annotations - recap @tiangolo

  10. Simple scripts with Typer @tiangolo

  11. Simple scripts - required arguments @tiangolo

  12. Simple scripts with Typer - main block @tiangolo

  13. Simple scripts - required arguments missing @tiangolo

  14. Simple scripts with --help @tiangolo

  15. Simple scripts - options @tiangolo

  16. Simple scripts - invalid data @tiangolo

  17. Simple scripts - more help @tiangolo

  18. Simple scripts - more help in the terminal @tiangolo

  19. Simple scripts - help for parameters @tiangolo

  20. Simple scripts - help for parameters in the terminal @tiangolo

  21. A Typer app @tiangolo

  22. A Typer app - app object @tiangolo

  23. A Typer app - decorator @tiangolo

  24. A Typer app - call the app @tiangolo

  25. A Typer app - supergreet @tiangolo

  26. Install completion @tiangolo ✨ Works for everything: • Zsh •

    Bash • Fish • PowerShell

  27. Use completion @tiangolo

  28. Use completion @tiangolo

  29. Use completion @tiangolo

  30. Use completion @tiangolo

  31. Use completion @tiangolo

  32. Completion @tiangolo 🧙 Works by default and can be used

    for: • Deeply nested commands • CLI Options and CLI Arguments • Custom data (e.g. remote, from an API) • etc.

  33. Commands @tiangolo

  34. Commands - hi @tiangolo

  35. Commands - bye @tiangolo

  36. Help with commands @tiangolo

  37. Commands - hi again @tiangolo

  38. Commands --help for hi @tiangolo

  39. Command hi in terminal @tiangolo

  40. Commands - bye @tiangolo

  41. Commands --help for bye @tiangolo

  42. More Typer features @tiangolo • 🥅 Boolean flags • ❓

    Prompts • 🔒 Ask passwords • 🚀 Launch apps (e.g. a browser) • ✅ Easy testing • ✨ More…

  43. Thank you! Sebastián Ramírez tiangolo.com typer.tiangolo.com github.com/tiangolo linkedin.com/in/tiangolo twitter.com/tiangolo